Research On Health And Energy-saving Optimization Of Non-visual Effects In LED Lighting

The quality assessment of lighting environment has traditionally addressed visual effect of on the working plane,with the improvement of people's awareness of energy conservation,lighting energy efficiency has attracted the attention of the industry,but the research of energysaving lighting is still based on the human vision characteristics.However,in recent years,the non-visual effect of light has gradually attracted attention,unreasonable lighting will have a negative effect on human circadian rhythm,such as circadian rhythm disorders,depression and so on.Therefore,better energy-saving lighting technology need to integrate human vision and non-visual characteristics.At present,the optimal control of lighting is the main way to achieve green and healthy lighting,that is,freely allocate the spectral energy of light source according to the needs of healthy and work,so as to maximize the utilization of light energy.The LED light source has become the best choice for health lighting due to its flexible and controllable spectrum.This paper focuses on the research of health and energy saving based on non-visual effects for LED lighting.The present study is divided into two parts,the first part focuses on the optimization of spectral energy distribution,and researches the optimization method of spectral efficiency of light source combining visual and non-visual effects.The non-visual effect of light source was quantified based on the evaluation model of circadian light,for the complexity of this model,a dimming factor is introduced to establish a mixed light calculation model which can achieve the flexible control of illuminance,chroma and circadian light,and a four-primary LED mixed light source system is built to measure and analyze the tunable range of spectral efficiency under the light sources at different color temperature.Experimental research shows that the mixedlight model can effectively adjust the visual and non-visual parameters of light source and measure the tunable range of spectral efficiency,the lower error indicates the feasibility of the model applied to the design of dynamic health light source.The improvement of spectral efficacy can be achieved by converting the optimization strategy between the maximum nonvisual spectral efficiency and maximum visual efficiency according to the specific requirements,in this paper,the dimming factor is introduced to achieve the conversion of the two spectral efficiencies.The second part studies the energy-saving dimming strategy of the driving power of the four-primary color LED mixed light source under health lighting,On the basis of the four-color LED mixed light source system,an analog-to-digital conversion module is added to collect the output voltage and current waveform of the four-channel LED,and then calculate the driving power of the mixed light source.This part analyzes the dimming method and chroma selection to reduce the power consumption of the light source by measuring the curves of different color temperature and light source power,Experimental research shows that under the same illumination and circadian rhythm stimulation,choosing a low color temperature light source can reduce the power consumption,Illuminance of light source is the main factor affecting the driving power of mixed light source,and it's more in line with energy-saving dimming strategies by adjusting chromaticity instead of adjusting illumination within the permitted range of chromaticity to meet the needs of healthy lighting.